The audiobook folder is for "Audible" file types only. Audible uses its own file loader which must be downloaded under the Audible Device center on their website ( Audible Website ) . This will put the books into that directory. For more information on this, please see in our knowledgebase.
Note: Other companies that supply audiobooks may record them in .mp3 or .wma format and thus RCA EasyRip sees them as music and not audible files.